Agree on the best/most interesting shootouts being ones with lots of abilities and where the order you use them in matters, so this is a great suggestion. Even if an ability is straightforward/vanilla, it can become interesting due to its interaction with other cards/the order in which abilities are used.

As I had mentioned in this posting, structure can work as its own design theme. Deck builds can inject more creativity for players by incentivizing non-traditional builds and injecting trip-up for 2-3 value play styles.